JPH028417Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a flexible antenna used in personal radio transceivers and the like.

[Conventional technology]

Conventionally, antennas for the above-mentioned purposes have been used in such a way that they do not break even if they hit an obstacle.
Furthermore, monopole antennas with flexible antenna elements are often used to prevent injury even if they hit the human body. A conventional antenna of this type will be explained with reference to FIG. In FIG. 4, reference numeral 1 is an antenna element, and this element 1 is a flexible conductor made of a coil spring or a plurality of elastic metal wires, each of which is tightly wound with a wire of the same material in one or two layers. A cover 3 made of a rubber tube or the like is fitted around the outer periphery of the cap 2, and a cap 4 is fitted to the tip of the cover 3, making the whole structure flexible. The lower part of the cover 3 is fitted onto the outer periphery of the first connecting fitting 6a which is in contact with the lower end of the flexible conductor 2 of the element 1, and the sleeve 5 made of hard synthetic resin is fitted onto the outer periphery of these lower parts. Further, a second connecting fitting 6b is fitted into the sleeve 5, and a connector 8 having a mounting nut 7 is provided on the outer peripheral side of the sleeve 5,
The connector 8 is connected to the metal chassis of the personal radio set, the chassis side of the set from the connector 8 is the ground side (- side), and the connecting fitting 6b is connected to the (+) side. However, when conventional flexible antennas are used in portable transmitters and receivers, it is difficult to obtain a sufficient grounding effect, so the operating gain differs depending on whether the set is placed or when the set is held. However, the operating gain is different and it is difficult to use.
There was a problem in that the impedance became unstable depending on the proximity to the human body, and the transmission and reception performance changed.

[Purpose of invention]

The present invention aims to solve the above-mentioned problems and provide a flexible antenna that is electrically stable and does not compromise safety in use.

[Structure of the idea]

In order to achieve the above-mentioned object, the present invention includes a flexible antenna element and a sleeve that serves as a ground side and is electrically insulated from the antenna element and placed around the outer periphery of the element from the middle part to the base side. The sleeve is made of flexible conductive rubber or conductive synthetic resin.

【Example】

Below, Figures 1 to 3 will be explained for one embodiment of the present invention.
This will be explained with reference to the figures. In FIG. 1, reference numeral 9 denotes an antenna element, and as shown in FIG. 2, this element 9 is made of a flexible conductor 10 made of a plurality of elastic metal wires 10a and metal wires 10b of the same material closely wound spirally around the outer periphery of the elastic metal wires 10a. A cover 11 like a rubber tube is fitted around the outer periphery, and a cap 12 is fitted to the tip, making the entire structure flexible. Note that the cover 11 may be insulating or conductive as long as it is a flexible tube. At the base end of the antenna element 9, a substantially cylindrical first connection fitting 13 is fitted onto the flexible conductor 10 and interposed between the flexible conductor 10 and the cover 11, and is provided on the inner peripheral surface of the first connection fitting 13. Annular projection 1
The base end of the conductor 10 is supported on 3a.
Further, the tip of the second connection fitting 14 is brought into contact with the annular protrusion 13a of the first connection fitting 13, and the second connection fitting 14 is brought into contact with the annular projection 13a of the first connection fitting 13.
4 is fitted into the first connecting fitting 13, and on the outer periphery of the first and second connecting fittings 13 and 14, there is an insulating insulating plate that engages with the flanges 13b and 14b protruding from the outer periphery of the proximal end thereof. A cylindrical body 15 is fitted.
An impedance matching coil 16 is built in this cylindrical body 15, and this coil 16 is connected to the second and first impedance matching coils.
It is connected to the conductor 10 of the antenna element 9 via the connecting fittings 14 and 13, and is also connected to the (+) side of a portable transceiver (not shown). A metal fixing tube 17a of the connector 17 is screwed onto the outer periphery of the insulating tube 15, and a mounting nut 18 is axially restrained and rotatably fitted into the fixing tube 17a. It is configured to be screwed onto the metal chassis of the transceiver. Here, a flexible sleeve 19 is disposed around the outer periphery of the antenna element 9 on the base side from the intermediate portion. In this sleeve 19, a fixing ring 20 made of synthetic resin is fitted and fixed on the outer periphery of the intermediate portion of the antenna element 9, and a metal shorting ring 21 with a vertical groove shape is fitted on the outer periphery of the fixing ring 20.
A flexible tube 22, 2 made of conductive rubber or conductive synthetic resin is attached to this short-circuit ring 21.
3, a flexible insulating synthetic resin tube 24 is interposed between the outer conductor and the outer conductor, which is composed of three layers, is fitted into the fixing ring 20 from the outer circumferential side of the shorting ring 21.
It is caulked and fixed. Note that, as shown in FIG. 3, an annular groove 20 is formed on the outer peripheral surface of the fixing ring 20.
a is formed so that the inner and outer circumferential walls of the short-circuit ring 21 are easily plastically deformed during caulking to ensure reliable fixation. A slight gap is formed between the conductive tube 22 in the inner layer of the sleeve 19 and the outer periphery of the antenna element 9, and the base end is located between the insulating cylinder 15 and the fixed cylinder 17a of the connector 17. It is inserted into and fixed by caulking from the outer circumferential side of the fixed cylinder 17a. The proximal ends of the insulating synthetic resin tube 24 in the middle layer of the sleeve 19 and the conductive tube 23 in the outer layer are disposed sequentially toward the distal end side of the conductive tube 22 in the inner layer and are open. The flexible antenna of the embodiment configured as described above has the metal fixed tube 17a of the connector 17.
conductive tube 22 in the inner layer of sleeve 19
Since the conductive tube 23 of the outer layer is electrically connected through the shorting ring 21, the tube 22, the shorting ring 21, and the tube 23 are on the ground (-) side.
Coupled with the fact that the tubes 22 and 23 extend longer from the middle part of the antenna element 9 to the base side, a sufficient area can be obtained, and a stable and sufficient grounding effect can be obtained. The operating gain does not change depending on whether a transmitter/receiver set using the device is placed or held, or how it is held, and is less affected by the proximity of the human body. And the sleeve 19 which becomes the ground side
is flexible even though it is long, so
The function of a flexible antenna is that it is unlikely to be damaged even if it hits an obstacle, and conversely, it will not cause an accident that could cause injury if it hits a human body. Therefore, it is safe to use. It doesn't harm your sexuality. In addition, in the present invention, the antenna element is not limited to the configuration of the above-mentioned embodiment,
If the element is flexible, it can be changed as appropriate, and the distance between the element and sleeve can be adjusted to accommodate these curvatures by interposing a flexible insulating material in the gap between the antenna element and the sleeve, or by inserting a supporter in the appropriate place. It may also be possible to prevent it from changing from time to time. Furthermore, the flexible antenna of this invention can be used even if the device does not have a chassis, and if used in a car phone, it does not require grounding, so it can be used in a wide range of applications, such as without damaging the car body. can.

[Effect of the idea]

As explained above, according to the present invention, a flexible conductive sleeve is provided electrically insulated from the antenna element at the base side from the middle part of the flexible antenna element, and this sleeve is connected to the ground side. As a result, a sufficient area can be obtained on the ground side, a stable and sufficient grounding effect can be obtained, and an electrically stable flexible antenna can be provided.The sleeve is also made flexible, so it can be used safely. The effect is that there is no damage.

[Brief explanation of the drawing]

Fig. 1 is a half-cut front view showing a flexible antenna according to an embodiment of the present invention, Fig. 2 is a partial perspective view showing the conductor of the antenna element, Fig. 3 is a sectional view of the fixed ring, and Fig. 4 is a conventional FIG. 2 is a half-cut front view showing the flexible antenna of FIG. 1...Antenna element, 2...Flexible conductor, 3...Cover, 4...Cap, 5...
Sleeve, 6a, 6b... Connection fitting, 7... Nut, 8... Connector, 9... Antenna element, 10... Flexible conductor, 10a, 10b
... Metal wire, 11 ... Cover, 12 ... Cap, 13, 14 ... Connection fittings, 13a ... Annular projection, 13b, 14a ... Flange, 15 ... Insulating cylinder, 16 ... Impedance matching coil , 17...Connector, 17a...Fixed tube, 18
... Nut, 19 ... Sleeve, 20 ... Fixed ring, 20a ... Annular groove, 21 ... Short circuit ring, 2
2, 23... conductive tube, 24... insulating tube.

Claims (1)

[Claims for Utility Model Registration] A flexible antenna element;
1. A flexible antenna comprising: a sleeve serving as a ground side that is disposed to be electrically insulated from an antenna element; and wherein the sleeve is made of flexible conductive rubber or conductive synthetic resin.